In Britain, the suffix " -wich" in a place name sometimes means it was once a source of salt, as in Northwich and Droitwich, although other - wich towns are so named from the Saxon 'wic', meaning fortified dwelling or emporium. Īll through history, availability of salt has been pivotal to civilization. Many salt roads, such as the via Salaria in Italy, had been established by the Bronze Age. However, salt was often difficult to obtain, so it was a highly valued trade item, and was considered a form of currency by certain people. It helped eliminate dependence on seasonal availability of food, and made it possible to transport food over large distances. Salt's ability to preserve food was a founding contributor to the development of civilization. It has been used by humans for thousands of years, from food preservation to seasoning. All life depends on its chemical properties to survive. Salt, also referred to as table salt or by its chemical formula NaCl (sodium chloride), is an ionic compound made of sodium and chloride ions. Ancient method of boiling brine into pure salt in China
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